Final answer:
Human chorionic gonadotropin (hCG) is secreted by the blastocyst's outer layer, ensuring the maintenance of the corpus luteum and the continued secretion of progesterone for a viable pregnancy.
Step-by-step explanation:
The hormone known as human chorionic gonadotropin (hCG) is secreted by the blastocyst, which is an early stage in embryonic development. After fertilization, the zygote divides and becomes a blastocyst. The outer layer of this blastocyst is responsible for producing hCG. This hormone plays a crucial role in maintaining pregnancy by preserving the corpus luteum, which then continues to secrete progesterone to maintain the uterine lining.
Human chorionic gonadotropin (HCG) is secreted by the blastocyst. When fertilization occurs, the zygote divides to become a blastocyst, and the outer layer of the blastocyst produces HCG. This hormone is important for maintaining the corpus luteum, which in turn produces progesterone to support the pregnancy.